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A baseband spoofing detection method for gnss receiver based on extended sqm

A spoof detection and receiver technology, applied in measuring devices, radio wave measurement systems, instruments, etc., can solve the problems of low detection effect and the detection effect of classic signal quality monitoring algorithms, so as to improve anti-spoofing ability and important engineering significance and practical value, the effect of improving the utilization rate

Active Publication Date: 2022-07-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

At present, the classic signal quality monitoring algorithm uses the mean value of the symmetry index for hypothesis testing, and the detection effect is low. Especially when the deception signal is similar to the real signal strength, the correlation curve still has a certain symmetry, and the detection effect of the classic signal quality monitoring algorithm is further reduced.

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  • A baseband spoofing detection method for gnss receiver based on extended sqm
  • A baseband spoofing detection method for gnss receiver based on extended sqm
  • A baseband spoofing detection method for gnss receiver based on extended sqm

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Embodiment Construction

[0076] The present invention will be further described below in conjunction with the examples.

[0077] like figure 1 As shown, a GNSS receiver baseband spoofing detection method based on extended SQM, including multiplier, correlator, coherent integral operation, phase detector, spoofing detection device, loop filter, pseudo-code NCO, C / A code generation Inverter and carrier NCO, the input signal and the local copy of the carrier NCO output in-phase carrier signal through the multiplier output the branch of the sinusoidal mixed signal is called the in-phase branch, that is, the I branch, the input signal is orthogonal to the local copy of the carrier NCO output The branch of the carrier signal outputting the cosine mixed signal through the multiplier is called the quadrature branch, that is, the Q branch. The correlator outputs the correlation result i E , i P , i L , the cosine mixed signal output by the multiplier and the leading code, real-time code and lag code output...

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Abstract

The invention discloses a GNSS receiver baseband spoofing detection method based on extended SQM, comprising a multiplier, a correlator, a coherent integral operation, a phase detector, a spoofing detection device, a loop filter, a pseudo code NCO, and a C / A code. The generator and the carrier NCO, the invention can ensure that the user receiver can switch the anti-spoofing structure or stop working in time under the spoofing environment, enhance the user carrier's ability to withstand spoofing signals, and improve the ability to resist spoofing attacks, which has important engineering significance with practical value.

Description

technical field [0001] The invention belongs to the technical field of GNSS baseband signals, in particular to a baseband spoofing detection method of a GNSS receiver based on extended SQM. Background technique [0002] Since the advent of satellite navigation technology, the demand for Global Navigation Satellite System (GNSS) in various research fields has increased. Satellite navigation technology allows residents to easily know their location, but there are still shortcomings. When the receiver obtains the navigation signal, its energy is small, and if the user carrier is in a deception environment, it will be easily affected by deception, and eventually the navigation will fail. Similar to normal GNSS signals, spoofing signals are more powerful pseudo-signals with altered correct code phase from a spoofing device at a specific location. Ultimately, it will disable the user carrier from tracking the real signal, tricking the receiver into being pulled to the wrong locat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/21
CPCG01S19/215
Inventor 许睿岳帅严乾君刘建业曾庆化陈武
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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